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Modifying methylalumoxane via alkyl exchange.

Harmen S Zijlstra1, Anuj Joshi1, Mikko Linnolahti2

  • 1Department of Chemistry, University of Victoria, P. O. Box 3065, Victoria BC V8W 3V6, Canada. mcindoe@uvic.ca.

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This summary is machine-generated.

Methylaluminoxane (MAO) reactivity was studied using electrospray ionization mass spectrometry. Alkylaluminum components show varying exchange rates, suggesting MAO

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Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Mass Spectrometry

Background:

  • Methylaluminoxane (MAO) is a crucial co-catalyst in olefin polymerization.
  • The precise structure and reactivity of active MAO species remain incompletely understood.
  • Octamethyltrisiloxane (OMTS) aids in selective ionization of MAO components.

Purpose of the Study:

  • To investigate the reactivity of MAO-derived ions with various trialkylaluminum (R3Al) compounds.
  • To elucidate the dynamic exchange processes within MAO under reaction conditions.
  • To challenge existing models of MAO structure.

Main Methods:

  • Electrospray ionization mass spectrometry (ESI-MS) was employed.
  • Continuous injection techniques were utilized to study ion reactivity.
  • Reactions were performed in fluorobenzene at room temperature.

Main Results:

  • Selective ionization of MAO in the presence of OMTS generated key ionic species.
  • Triethylaluminum (Et3Al) exhibited significantly faster methyl group exchange with MAO ions compared to triisobutylaluminum (iBu3Al) and trioctylaluminum (Oct3Al).
  • Observed exchanges were reversible, indicating dynamic methyl group transfer.

Conclusions:

  • The reactivity patterns suggest that the active components of MAO possess a non-cage-like structure.
  • The findings provide new insights into the dynamic nature of MAO.
  • This study offers a novel approach to probe MAO reactivity.